For Sharapova it was a much less gruelling affair than her three-hour marathon victory over Lucie Safarova in her previous outing, but she must now add the scalp of Radwanska to stay in the world top 10.

Fully focused: Despite appearances otherwise, Maria Sharapova made serene progress into the last eight of the Porsche Grand Prix

Ana Ivanovic remains in the hunt after after a 1-6 6-2 6-3 comeback win over German wildcard Julia Goerges and will meet Svetlana Kuznetsova next following the latter's 7-5 7-6(4) defeat of second seed Simona Halep.